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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8234d3f0a531f7ec6796a48c9f9ac91316fe09a920e3968bed1cb3b4981972d' 
  AND token = 'W9cS9aR8GqjS7/svf3mo/2bXrLnQdOnWdcteL3U52OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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