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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edcbee5b30c44bad27fb965655f1f428ee86164a03136067ec03a76d32300fb7' 
  AND token = 'pz5NqUnOFpabEMpp8mEkkItf4tIi/Fuo0GHkFDRm5/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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