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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a1d00c2ed4491d1daf68e177ae211f53854ebf876f4fe0908a282732c9d7c5' 
  AND token = '3abG2lkboXt9Nu2LqBrKxLpOJJYwaAICdlv02mpzvuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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