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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e2755ef8ff4a48b2dc75ca4419262fd8baf1c66508509a9ca6765f4f3303ce' 
  AND token = 'wbAWpRPb0X+vA7lhk8ou8hhXWbqCQJDicya+k9KGFQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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