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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7487ccc173c58d7faad80824ed7ae07278017b2aa25de0fdede672fe78c9d5e' 
  AND token = 'wLsYiZ0dGg69JWBst6lEM1IepmvSc2eAoCxsSmURoH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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