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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e4d8705507132c3b69d8032d89aae657918b3838335fb34c14fa038322e076' 
  AND token = 'DsXwy3KMPV2D4eeNeijU0qf6i/rk3UEVgKwJ83Q9nf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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