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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5988d1f51b08e9b6942f782a0d3d5596ccee326eda461f4f0a177e4b5c8b93' 
  AND token = 'cQ2D+tenPV7p+7CWze1DU89As4r7NuBvPdpesTjwcLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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