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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69423fa686fac1fe0db143e0170421a6c684ebffda4268f51dc79f4ae4ade1f1' 
  AND token = '2xEEGKxLvf/g+2PQCAEHEy/+HmKsiwLPukmAQxd3vcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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