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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18eefc1f79e6d43598367d6b7088ceefdaa6e0994e4d02b0a6914e76a015f098' 
  AND token = 'e8w2VNKeNzFCIlhFQ3ElPZ/cgHt3DexSikujrlhVs7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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