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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552d1e1c343f6b71237818da7e01e2bfb077d5e9ec8de108f82ff53640edf52a' 
  AND token = 'RG7UoZabTIX8u7WRYcrvDSKjLH+X1X5UM0b5l59h/QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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