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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8850ff2eb9819eabbd7d0f8ef178cf57c5bb7c344ffa8e02454b3a2ecac4c453' 
  AND token = 'g1nLVM1/T5JBevroeA4hUvODYpuPYmOcxlTa7wJzfAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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