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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d7342d0f253687f394ba94ce3bf77bd1e15525b57760a62dab19c83261fcf7' 
  AND token = '5XrgiTkHNS4USdv/o4veWO/p8/p5ZkifqIui6WQChVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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