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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097472149a8b7862430c6b9b5230e99d2398575593d234f8cf5c5fdedf741385' 
  AND token = 'e7Pd5bY1Cl5pW0gu+NV0F3uughzAlr1FAT3wCekaaTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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