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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c0833b3cc9e8ca704d6fc4aa798976a0e8ea1f0334f2aed95ad76907d04665' 
  AND token = 'ma8+Lvt5ea2+dClE0jgjZJcImc4yqPSG5QohT3OksNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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