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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffddfbd3caeb0e9a933d6b1a1ecd5a87d772d9e1e37690f40323e1a1dea34ee8' 
  AND token = 'vWfnix6zICJyb9tUvSbpmrl/57Iej2Xm7FitthWhOxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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