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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83a10acb37bf037bd5951744b34ac8664ebbbab96225a7c56c38b06f87a53c5' 
  AND token = 'edwZS2r6ZIZzluUsm39b+R/NfQL2LMf5RA9q2cFLvG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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