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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9e970aca371c602dc03a121a7018545442412a0df5bc072c63d3792daf92ac' 
  AND token = '191H+O+NpdYcN6yo2Ub/uZqmD8sb4mwajG8BsFX0aoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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