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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc46d9aed12ff628f8a5a4b25e342e303eec5b08864be4fd3d2e09e1fa44c4cd' 
  AND token = 'Z87jSY/BXe/lWyd1lG60LUm02PWMKa7svKL8Oce3z+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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