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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085a566f4f916a5236912b8f6ba7d6f54e5c8bc83dbe96c486244b47e00875f0' 
  AND token = 'GCxmhUYliYYclwC2rXlATP3OochiRHMhpwUtoYUkuIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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