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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a037e4388e0a27549028bb8602828ce0f1ee8542f99f3f201a8d0c41137ecc2' 
  AND token = 'WD+kvg05ZOgQT16VAE+E6WapDlzB2l6Yy720vXpfJ6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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