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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55096f7066ba3a8a0f814decb91f26d4f0c275f01509203cb7820c9565698ebd' 
  AND token = 'ZDci2FVsS/pRFmvpufgm/Jbyr5o/LyX4Q6DUXX9yEn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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