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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060586c9e6dab905af3f655aa353b57aee9f55f57a439a2deec6c6aadc1dc9dd' 
  AND token = '3jeQ5IjDpEfDTCI/9Y1Q8Zj27T35+dYoiR9LyRYhs2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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