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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79514668e7e47b1c9c0aa56dff4f39d82752741fb3aecfabecd4ee95e66154c8' 
  AND token = 'jRwt+7wXE5mz5t3anTb6cLUP4orY+i+9GpPvDIHwvVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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