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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8a47c3c5dbf44409b7be5b033a270379cd59ea9cb6ab792712317bc538488a' 
  AND token = 'wgpjJHNS2IZ/tm+mblk2PBa4fkYCde88fO12ajXu/38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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