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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd493f265eb7bbabf44eea4bf939fd9e487ca49710467f05fadd690e90d4fa1d9' 
  AND token = 'QqrfdQ1X6o9lLOrWgOD+Wdpqxsft3Q4CjNQklASXKpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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