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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd1c4cb4b7e7f00cb1bcba4df1eaeecd66dac5043534c102ed7e733c8937ee0' 
  AND token = 'L0bduKISRRRD+Q8ZlZTEqU8aaHmlHcrJ+AOLw6d8GwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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