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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c681f20a1f1adbee2d570f6c44c2f5f09f8e98e0da200fa4f9ff31687fd35497' 
  AND token = '+p2M96PqQLrWi2LYmurwWgl3sH+9tBKMY+gAadi1QBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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