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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa7e69d17742736951f6690e64e66507eb50d8e8ff2f74b9bf64e48ad1362a0' 
  AND token = 'sWIBcrKRG0UN7eg9sI/s5PMAQtri4t8C0ylg0zFhqIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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