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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3decbb31a5aaf040e425af4d24decf1ad16390a47137cbe41452d882cd383e' 
  AND token = '+8PCzMZQIdMo20TxDgYAIEMUHlMNzk9YhytIqIQxFR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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