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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f387d8fd797419bf6b4f6e70ae347ca2a49856ba59cd1bc553326902934936a5' 
  AND token = 's/MdTuG9SBLu3VVJSIeQtJCR6XymUPc766eJNdtyPTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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