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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d80ffb4e1827864086c33ea93a37ae0478f662a942b20e1000a14993308d23' 
  AND token = 'yXxr1gj6xau/yLE3BYTAC/2Ap6PTEQqS3G29QpjNbR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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