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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0236d000f65e6b8c2dd36c43514e53992ef3ec9f1ddfd0e00f60499b398788' 
  AND token = '07V5Tb+cR6cF+sgGD6rojaAVdZZy6fMcXTzz4jBmEYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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