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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e898bbc2d96c95e2d1b52aea952b04cc0dd33bbd113558542f1139e32c3a8db3' 
  AND token = '1LF/jZb42iTVjbNPXHINbWSj9nlaZLac2bK9d5m0X+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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