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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5dd93451fbb190827d5b52c0460a63d7b22fe3a6fcd5f6baf333a0c946c66c' 
  AND token = '59psmDYv8D+71pZZlyL3jYg4xfZdRWqr3B9/rdQSAlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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