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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b996a35f75ec92c040d1377f08b9092bd7683cef9b4d5165cd9a2dd23be43ded' 
  AND token = 'bQdV0VsvObOZpa9O6bL9CdM/iXAQ+gaWcKzvKaNCcvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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