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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc82c6f9b8ad852b8160c8429be370a9de1b90bd2cf02325ed8efae3a5f4c73' 
  AND token = 'Ty5QNpAeT1DBPfnsWcJEOT9wDY1qnB9tuG03oTok33w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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