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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69eb27144c8554ee6c2ec80ee0a39c714d1a9fe0ec57dc82adc98d1d9f603d0' 
  AND token = 'NOi5IMH6sFIZRUjU0V+gFsFXdbsBSsmV+MxJEOD4EHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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