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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf4f0ed3d4fc90de8f56a5cc4e759c2921aaa0e17fdd0196dade6a7c611281c' 
  AND token = 'SOSTlboObQwiSBDTde3qu4TFz7bypHP1/pywkeigVFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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