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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e58fa4e1a1b72fdd48514a1bbb3c5b2917641b65c00fb446dd1eabfd5507713' 
  AND token = 'UGQnWXmWyx/kPBHXDTZ1MpH9oFWtz4cyXj2W+kIK/Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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