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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b4aeb1a14bc38b0eee6bcf04b6a5226d58d722584c0808fda2470cb11f35b0' 
  AND token = 'IFA8LKwn8E/IAaZ5ofvQHnEVD2HJLFBh531NUJDvggA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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