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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266b3a8b116c3a784502eac4b75f51bfcf9fc16dcef02835d9c84bcfaeba2c78' 
  AND token = 'KofnyJa06aZNJtU37OPL5pKWac/rDCAiQfT1sO2DaRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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