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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f20d07d459baf5b1427471787a3317d29329aad2ae49fe824bea873e2cbaf1' 
  AND token = 'L3X9Gdd14LBtz8JTXDtohAz4x5cQAtozhR1FuOqPNiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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