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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0c41b49fb9f807832f0bcd2b4c170c5d87cacb189514f367a995d5af738a76' 
  AND token = 'uuRefUV+I7bOQPTgEd9tEExAgs3wXvCGkjx72UfmT38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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