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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa8b4f353fc52aa842db79491e33d725f3e4d821ff8d1a019b735befc2a01ef' 
  AND token = 'RJdTnOgElJG4tE6+JFe4OPJcmDKoh6e+4iNG0KOg26s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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