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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d3805f5d6d227d15655352bc7b7ee6852945105484505af722dacbf7bc0369' 
  AND token = '75R7C+sDPoSIGVOoEQ0il2D5D4Ay7GuCcMAuD+ArgYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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