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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1decee1d65fc422465fb88fcb858abd211bf324532e9d5a8b4221cc8e079a44f' 
  AND token = 'eBgxu8JPyOMaKvaqu1kyLp1ADLsz45aunI4ree1chEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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