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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a135870b1a83f1acc77ffdb69975e861f160e7c31a2e49adca9071dacd4b24cb' 
  AND token = 'O9pbpqNWj+2BBsaFoalfPyEBSQEsyaAu1F3IHytFgPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}