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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cd91003492800a291c056dac23e87d42727f5c4d4c116a81c21e78276b2c66' 
  AND token = 'UK0+aphlo9Mii5u/PcYMYW/NTnoQZQZWgCqN0FBaQnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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