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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcff96217c1faa91c9eac9f906532776e744d25d19aaf72c8aca2bf5e8f2caed' 
  AND token = 'dBTj1Yae66LW20IqNw8qmov14rLuYx+/lHk3NMIA/Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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