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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ef25c788c4fe8753aa7a6942f8bc4fe96af44ef16f3c2158852a1bfb75f77a' 
  AND token = 'ytbWPeI1WRAd2mb9MtGXN220i4cb44wcATPPUbKCTCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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