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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11c5d72281ece2f5e6d7d840300aaee400fdf98fb54c927da1da970440c8d65' 
  AND token = 'ZbVbIqN914DJKH97F8fCSuGhQFUgyl47cgIi5JZo05U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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