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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b19cf5d44052b9f39c6570fa48fa22bd5db2544ae8dce4eef5f345f5874e3d' 
  AND token = 'f+sNPytNFrQjqmHxR3XZD7ShzRAXmEQMe/xuvybJvKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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