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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5ae4b9c8a96710f8be0f7edf4d10710203ac5961cb9e17ab863acea938a371' 
  AND token = 'CA3Et93z2XX6YtJWXzMr1Og0+kxapUBz3Gj4wyaDMTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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