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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96899a8bedc92de20800d00d29680a3b910493011ece5786789f4e29ce3b4b09' 
  AND token = 'Oojxxt1n40Zur4o52jpvNJ67r5PqoNKNU5I+gJvO0b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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