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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c74ad67e10baaf6e4379f55336bc71fab8cccb40ee8ea19c1a3edd456f0054' 
  AND token = 'e8rmIaf79fdgDRLyi5Fl1rx8E2ggGBmfel+2IKgjPNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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