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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f0a42cf5f9ff8726e0e1006d7dc01a266c322292a51d036276299e4de91aa8' 
  AND token = 'QAb1FkKkrfnCZwylzYP7117MAnkGn8eieXSlR01X3kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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