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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8748ffce5f1852f25f67826a875b0fcc07bfc667a2b2183c8e8df3ebb8e91ed' 
  AND token = '7pP+Q12WTsfpU4uCmvpRCe9ubcXjC+u2a6x4nBtLwrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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