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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfea98329538b71c18737fcb8034dc211b246c9d3fc6ab3552a64a05603087c' 
  AND token = 'ntZjwDto2K1E1wFYeqQtCmAdI74so0lf+dmSlQSgBD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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