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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc52d937703385ef0b77fdfc0afe1ab33422a78c45c70f771453a0f125458b34' 
  AND token = 'ERsNy7UjNu/U2LzQbBWBB7I3QbGd0khX0VM2ThLaYi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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