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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8795e40f31f9d83e2479392ca150866f5c4e1be4611b0e7c934de0fc8090b9a7' 
  AND token = 'x2lOKNY5jp46EUt0tPSWEr9ackcOsWXPbTLJeo9hvSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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