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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82493fbab28dc9f3f078d954477f92896d937c9611f19fe2a92d846a85eae39c' 
  AND token = 'l1FH5nueM7rweOjGxr4rxMN/znwviCQLBeZpKwAOwpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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