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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebac6b1e09d74d98871dbcdf1d2c25bebd017f4e9171d2d8f5358206fdea4af' 
  AND token = '9NmOWX1y1tTtlls5kbh4mCJxX0ZOaSLnttD3yNRl5WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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