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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbaaec2dca68dd4bc733c34b11d203af7d6acafc8ac91e7f4f94121da576b0d1' 
  AND token = 'BLs4HQQ81YsTjzW5j6NCVrQNl+f4kesIRDpufEI1XAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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