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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7381da5c259aa59edfe35e69cc2a59334dee9d32857f43e15782ef520199171' 
  AND token = 'e8WyjLTJrY8aeiB05Bv9CFqzGWy2IFC803eooYxGaoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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