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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10c9948e64a27e721ff5b942e2150d65ec04efc88a9488b3d6fe413c158efbd' 
  AND token = 'fDt1b+9vYXzbF9O+lYZ4hMXto27nfofOzGT96nD5Vt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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