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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32e5154f1f4a2ed03bfbea4cf5f27b0dbe12c84b34839f9fea9a623248c9ef0' 
  AND token = 'W4/dQvVb4ACqdYMKE7lEkf6+Oj3mjxU0E262tDRCNNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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